Toasting machine



Jan. 30, 1940. l w. A. GRAHAM' TOSTING IACHINE n original Filed Dec'. 19. 1936 .2 sheets-sheet 1 Ma/Tamm 2 m h t u h s 2v 6 5 .GIN O ME. Amm.. ."u. mmc um Gd mu A.T..1 wg; o rn n. i E .1 r o C .lm 3o, 1940.

Reiuued Jan. 30, l19410 PATENT OFFICE TOASTING MACHINE William A. Graham, Houston, Tex., assignor of thirty-nine per cent to F. S. Henshaw and ten per cent to Bennett Patterson, both of Houston,

Tex.

original No. 2,105,858, dated January 1s, 193s,

Serial No. 116,830, December 19, 1936. Application for reissue May 16, 1939, Serial No. 273,961

19 claims.

This invention relates to toasting machines, and it is primarily an object of the invention to provide a machine of this kind using a fluid fuel, preferablygas, under pressure and wherein means are provided under control of the fuel pressure for shutting oiT the supply of fuel to the burner after a predetermined period of time and also to eiect a release of the bread or other food.

The invention also has for an object to provide a machine of this kind including a carriage supported for up and down movement with respect to the heating unit and wherein said carriage is provided with means fornormally urging the same upwardly and wherein is also provided means for holding the carriage in its lowered position, together with a timing mechanism under control of the pressure of the fuel being delivered to the burner for releasing said holding means.

Another object of the invention is to provide a device of this kind comprising. in its construction a carriage supported for movement into either an effective or ineifective position together with a timing mechanism for holding the same in effective position and wherein said timing mechanism operates under control oi' the fuel i'lowing to the burner comprised in the machine for releasing the carriage from its effective position after a predetermined period of toasting and at the same time shutting oil the ilow of fuel to `the burner.

An additional object of the invention is to provide a toaster including a carriage .supported for movement toward or from a heating element together with means for holding the same in eiective position with respectto such element and wherein automatic means are provided under control of the flow of the fuel to the burner for automatically releasing the carriage from its effective position together with additional manual means operable at will 'for effecting such release of the carriage.

The invention has for a still further object to.'

' provide means under thermostatic control for initially creating the desired temperature,

The invention consists in the details of -construction andin'the combination and arrangement of the several parts of my improved toasting machine whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will here` inaiter be denitely claimed.

In order that my invention may be better understood, I will now proceed to describe the same with reference to the accompanying drawings,

wherein: l

Figure 1 is a view in vertical section with portions in elevation and of somewhat a diagrammatic character illustrating a toasting machine in plan showing the controlling valve for the motor in a second position from that illustrated in Figure 2; 1

Figure 5 is a view similar to Figure 4 illustrating a still further position of the valve;

Figure 6 is also a view similar to Figure `4 illustrating a still further position of the valve;

Figure 7 is a sectional view taken substantially on the line 1--1 of Figure 3;

Figure 8 is an enlarged fragmentary sectional view taken through the rotary valve as herein comprised with certain of the adjacent parts being shown in elevation;

Figure 9 is a detailed sectional view with parts in elevation illustrating the thermostatically operated valve as herein employed.

As disclosed in the accompanying drawings, B denotes -a base carrying at its' rear portion an upstanding post I of desired dimensions. Pivotally connected, vas at 2, to the upper portion oi' the post l are the elongated parallel arms 3 of desired length and the mounting for whicl` permitting the same to have swinging movement in an up and down direction. In Figure 1 these arms 3 are shown in their lowered position while their upper adjustment is indicated by broken lines. The forward end portions of these arms 3 are connected by the vertical arm 4 in parallelism at all times with the post' I. The extremities of this arm 4 are plvotally connected, as at 5, to the forward endportions of the arms 3, the pivots 5 being spaced apart the same distancf as the pivots 2.

'I'lie central portion of the front vertical arr. I has rigidly secured thereto, as indicated at l, an end portion of a rearwardly disposed carria ,fe l which is positioned below a slot il in the top wal' 9 of `the enclosing housingA H which is suitablyI mounted upon the base B. Itis to be stated that there may be provided in the top wall 9 of the housing H any desired number of slots 8- and that each of said slots 8 will have arranged thereindicated by broken lines in Figure 1, the bread slice thereon will have been partially ejectedk up through the slot 8V to facilitate its removal, and When'the carriage is in its lowermost position, as illust-rated by full lines in Figure 1, the bread slice supported by the carriage is in effective position to, be properly toasted by the flame from the burner I0. The burner I'II may be of any preferred type capable of performing the work desired although it has been found of advantageto have this burner of. an H design as by so doing a simple and convenient means is provided for assuring the desired toasting on both sides of the bread slice supportedby the carriage 1. As this type of burner is well known a detailed description and illustration thereof is believed unnecessary.

The burner` IIJ has delivering thereto la supply line I I which,l if desired, may be coupled by a fitting I 2 directly with a source of gas supply' and particularly should it be desired to use the burner independently of the automatically operating mechanism to be hereinafter more particularly referred to. 'This fitting I2 includes a valve I4 whereby thedirect connection of the line II with the source of fuel supply may be readily Acut olf.

Interposed in the line I I is a valve structure I5 including a valve member I6 normally maintained in closed position by an expansible spring I1 herein disclosed as encircling an extended portion of the valve stem I8 and interposed between the casing of the valve structure and an enlargement I9 at the outer portion of the stem I8. This enlargement or head I9 is positioned for contact from above With-the .lower arm 3 when the carriage 1 is lowered with a resultant opening of the valve member I6 for thel flow of fuel to the burner I0. The supply line II in advance of the valve structure I5 has in communication therewith a pipe line 28"'leading to an enclosed manifold chamber M; The communication of the line 28 with the chamber M is through the bottom wall 2| thereof. The maniinserted end portion of a rock arm 29.

'rus

-fold chamber M has .delivering therein a pipe line 22 leading from a suitable source of gas or other fluid fuel under pressure. This pipe line 22 in advance of the chamber M has leading there-A of thesecompartments 25' and 26 is intersected` by a diaphragm 21 preferably of rubber whereby each of these compartments 26' and 26 is divided into two chambers a and b. The central portion of the diaphragm 21 is fixed, as at 28, to the 'I'his rock arm 29 extends within the chamber a of a compartment 25'A or 26' through a suitably positioned opening 30 -provided in the wall of the member. This opening 38 is of a size to allow forv the desired movement of the arm 29 which is xed to move with a rock shaft 3| which extends upwardly and within the manifold chamber M. This shaft 3| between a member 26 or 26 and the bottom wall 2| of the manifold chamber M is enclosed within a surrounding sleeve 32 herein disclosed as integrally formed with the wall of a member 26 or 26 and having sealing engagement, as at 33, with the bottom wall 2| of the manifold chamber M. By this means escape ofthe gas or kindred fuel is prevented out through the opening 30.

The shafts 3|, as particularly illustrated in Figure 2, have fixed to their end portions within the chamber M the rock arms 34, the outer or free end portions of which having pivotally connected thereto, `as at 35, end portions of the rigid links 36. These links 36, in turn are operatively connected at a common pivot point 31 with a crank 38 carried by the upper portion of a worm shaft 39 suitably supported forfrotation within the chamber M.

The rock arms 34 are in such relative angular relation as to assure the requisite push Iand pull through' the links 36 upon the crank 38 to effect the desiredrotation of the shaft 39 as the several shafts `3| are rocked. It is also to be noted that the rock arms 29 hereinbefore referred to travel in opposite directions,` although moving simultaneously when the machine is in operation, the extent of throw of the rock arms 29 in one direction depending upon'the extent of looseness of the diaphragm. The movements of said rock arms 29 in the opposite direction are limited by contact of each of the rock arms 29 with-the inner marginal edge portion of the slot or opening 30 through which the rock arm 29 is directed. Fixed to and rotating with the shaft 39 is a disk valve member 4D having close contact with the inner face of the bottom wall 2| of the chamber M. This disk valve member 40 is eccentrically arranged with respect to the shaft 39, said valve .member' being of such radius and having a high point of throw that, as the valve member 4II travels around with the shaft 39 the ports c, d, e and f in the bottom wall 2| of the chamber M will be opened in the proper sequence so that the gas or other fuel underl pressure delivered within the chamber M will be properly discharged within the chambers a and b of the members 25 and 26 to effect the desired rocking movement of the arms 29. These ports c, d, e and f are equidistantly spaced from the axial center of the valve member 40 and also a distance in excess of the low point of the .valve member 40. These ports c, d, e and f are also equidistantly spaced one. with respect to the other. In the present embodiment of the invention the `port c is in communication with the chamber a of the member 25 through the pipe line 4I while the port d is in communication with the chamber a of the member 26 through the pipe line 42. The port e` is in communication with the chamber b of the member 25 `through the pipe line 43 and the port f is'in communication with the chamber b of the member 26 through the pipe line 44.

The valve member 40 as illustrated in Figure 8 e has the major portion of its under face recessed to provide a valve chamber 46 with which the pipe line 2li is at all times in communication while three of the ports c, d, e and f are in communication with such chamber when the fourth of such ports is open. It is also to be stated that there .is one of these ports in communicatlon at all times with the manifold chamber so that when gas or kindred fuel un'der presillustrated in Figures 2 and 3, the port e is open ,and the gas under pressure within the manifold chamber M will pass out through this port e and through the line 43 into the` chamber'b of Vthe member 25. The resultant expansion or dilation of the diaphragm 21 within said member 25 will force gas within the chamber .a' o ut through the line 4I and port cinto the valve chamber 45 andthrough the line 20 to the burner l0. At the same time the rock lever 28 within said 'member 25 will be swung in a direction to effect push upon the crank 38 in the position to cause the valve member 48 to close the port e and tovopen the port d. With the port d open the gas will .flow through the line 42 into the chamber a of the member 26 and force the diaphragm 21 toward thechamber Yb causing gas nwithin the chamber b of the member 26 to pass out through the pipe line 44 and through the port f into the valve chamber 45 and from there through the line 28 to the burner. This movement of the diaphragm 21 in the member 26 and the associated rock arm 28 will cause the second link 36 to push the crank 38 a distance sufcient to close the port d and to open the port c. With the port c open the gas under pressure will flow vfrom the chamber M through the pipe line 4| into the chamber a of the member 25 and force the diaphragm 21 within said member 25 toward the chamberV b, This movement of the diaphragm will force gas within such chamber b out through the pipe line 43 into the valve chamber 45 and from this chamber 45 through the line 2D to the burner l0. Also during this move'- ment of the diaphragm 21 within the member 25 the associated rock arm 29 will be'moved in a direction to cause the first link 36 to impose pull upon the crank 38 sufficient to close the port d and open the port c. With the port c open the gas under pressure will pass through the line 4| into the chamber a of the member 25 and force the 'diaphragm 21 within such member 25 toward the chamber b. During this movement of the diaphragm gas within said-chamber b will pass through the line 43 into the valve chamber 45 and from the chamber 45 through the line 20 to the burner I8. During this movement the rock arm 29 associated with such diaphragm will cause the first link 36 to impose pull upon the crank 38 sufcient to close the port c and to open the port f. With the port f open gas under pressure within the manifold chamber M will flow through the line 44 into the chamber b of the member 26 and the diaphragm 21 within said member 26 forcing gas within the chamber a out through the pipe line 42 into the valve chamber 45 and through the pipe line 20 to the burner. This movement of the diaphragm 21 will also move the associated rock arm 29 inv a direction to cause the second link 36 to impose further pull upon the crank 38 suflicient to close the port f and to open the port e whereupon the cycles ofoperation will continue until the gas ow is completely shut off as by closing of the valve I6. l

Mounted to rotate with the shaft 38 is a worm 38 which engages a worm wheel 46 fixed to a shaft 41 extending outwardly of the manifold chamber M. The extended portion of this shaft 41 has fixed thereto the pinion 48'meshing with the gear 49 suitably supported for desired rota- 21,886 M there will vbe a substantially immediate funcof the links 36 the gear 48lwil1jalso be caused to rotate at `a desired speed. Fixed to rotate with the gear 48 about the same axis is a disk 60 herein disclosed as of a diameter materially less than that of the gear 49.v Overlying the outer face of this disk 58 for frictional contact therewith is a second disk 5I. This disk 5I is freely mounted upon a shank 52 extending outwardly from the axial center of the disk 56 and the disk 5| is maintained in desired frictional engagement with the disk 58 by the expansible member 53, herein disclosed as a coil spring of desired tension', interposed between the disk 5| .and a nut 54 or other enlargement engaged with the outer end portion of the shank 52.

Extending outwardly and laterallyv from the disk 5I is an outstanding pin or lug 65 which, as the gear 49 rotates, comes into contact with the outer end of an arm 56 extending from an upstanding handle member -T herein -disclosed as having its lower extremity pivotally connected, as at 51, with the lower portion of the post i.

This handle member T is of a length to extend above the top wall 9 of the housing H and'for which purpose said top Wall 8 is provided with a slot 58. As the gear 49 rotates and the pin or lug 55 contacts with the arm 56, the handle member T will be rocked a distance suflicient to release the holding member or lug 59 carried by the handle member or tripper T from the lug 6l!A depending from a weighted member 6|. This weighted member 6| is carried by a rearwardly disposed extension 62 of the top arm 3 and when the lug 60 is released the weighted member 6I will cause the arms 3 together with the platform 1 to swing upwardly and at which time the valve -I6 will immediately close, thus bringing to a stop the operation of the machine except the pilot light 24.

A s the weighted member 6| moves downwardvly the arm extension 62 has contact with the Yto stop the machine for any reason other than its regular operation, it will only be necessaryto push the handle member or trigger T rearwardly.

Figure l also discloses a retractile spring 64 secured to the handle or trigger T and the top wall 9 of the housing H for normally maintaining the handle member or trigger T in its raised or effective position.

The carriage 1 is herein disclosed as provided with a forwardly directed handle member 65 extending out through a suitably positioned slot 66 in the front wall of the housing H. This handle member 65 provides means whereby the carriage 1 may be readily lowered toy start a. toasting. operation. AIt is believed to be obvious that as the carriage 1 is forced downwardly the lug 60 will readily ride-over ltheY holding member 58 for the purpose of proper engagement with the lug 68. The holding member 59 preferably includes a. roller with the upper face vof the lug 66 properly curved in a direction lengthwise thereof. Also when the carriage 1 is in its lowered position, the lower arm 3 will have proper of the valve I B whereupon the motor action which includes the diaphragms 21 will effect the desired rotationfof the shaft 39. In this connection it is..to beistated that at no time is the toasting yoperation of the machine suflicient to effect a complete rotation of the disk 50.

In the initial use of the apparatus, the interior of the housing or oven as it may be called is cold and, as herein disclosed, a bypass 61 is provided connecting the supply pipe 22 from aA point in advance of the manifold chamber M to the delivery pipe line 20, said bypass line 61 bridging the manifold chamber `M permitting a` member 10 adapted to be forced into closed position by an expansible member 1I herein disclosed as a coil spring interposed between the valve member 10 and a plug 12 engaged within an end portion of the casing 68. Carried by and extendy ing outwardly from the casing 6B i's an elongated thermostatic element 13 preferably a copper tube closed at its outer end and having its bore communicating with the valve casing 6B at the educ- Crease.

tion side of the valve seat 69. This thermostatic element or tube 13 is of a desired length to be expanded by theheat within the oven afforded In the operation of my toaster the thermostat is normally contracted when the oven is cold so that valve 10 willbe in open position, as seen in Fig. 9. and gas iiowing to the device through pipe 22 will be partly diverted around the manifold chamber or timing device M through the pipe (i1l and past the valve 10 to the burner supply pipe' 20. there will be a diminished supply of gas going to the timing device M. As the-burner' begins to heat up the oven, the thermostat 13 will begin to expand and will act vto gradually move the valve 10 toward closed position. This will cause a progressive diminishing in the amount of gas owing through the bypass 61 and a resulting increase in the amount of gas flowing to the timer M. The valve 10 will finally be closed and all the gas will flow to the timer. The timer will be thus controlled. When the supply of gas flowing to said timer is limited by the diversion of part of the supply through the bypass 61, the

timer will operate more slowly due. to theslo'wer filling up of the chambers a and b of the actuating mechanism. Thus, when the oven is not fully heated up, the timing mechanism'will operate more slowly 'and expose the bread to a longer` contact with the heat.. But as the oven becomes hotter the timer willspeed up and the time exposure of the bread to the heat will de'- I am thus enabled to ejectthe toast at the proper time no matter what the temperature of the oven is. The length of time the bread is subjected to the kheat of the burner is thus in direct proportion to the amount o'f gas- 21,386 contact with the head I! to effect an opening-v Thus when .the valve 10 is open passing through the timer. If the bypass valve is restricted or closedthe gas will pass through the 'timer in greater volume and thus operate the timer more rapidly and hence speed up the operation of the timer and decrease the time `of exposure of the bread to the heat. The device may be readily calibrated by tests until it will automatically eject the bread when it is fully toasted-and in due regard to. the oven temperature. When the oven is fully heated the operation of the timer will be uniform, but on a decrease in the temperature of the Yoven the valve 10 will begin to open and slow down the timing mechanism. lThe operation of the timing device under control of the thermostat is a valuable feature of the invention It is to be stated that it is not intended 'that 'the invention be limited to the use of the particular type of thermostat herein disclosed as it is within the provincek of the invention to employ any other thermostatic assembly which can be used. It is also to be further stated that while this thermostatic element is particularly desirable upon the initial use of the apparatus,

it is equally desirable should for any reason the ytemperature within the housing or oven drop below the desired temperature during the use of the apparatus.

This application is a continuation in part of my application Serial No. 106,285, filed October 19, 1936.

From the foregoing description it is thought to be obyious that a toasting machine constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is-susceptible of some change and modification without .departing from theprinciples and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

I claim:

l. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner leading 'from a source of fuel under pressure, a normally closedvalve interposed in said line, a carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, said valve and supporting means for the carriage having coacting parts to.

open the valve for fuel flow to the burner when the carriage is substantially at the limit of its movement in one direction, releasable means for holding the carriage at such limit of its movement, and means under control vof the fuel flowing through the fuel line for releasing said lmeans to allow the carriage to move in the opposite means for the carriage having coacting parts tojm open the valve for fuel iiow to the burner when the carriage is substantially at the limit of its movement in one direction, and timed means under control of the fuel flowing when said valve carriage to move to its second position.

3. A toasting apparatus comprising,`ln combination, a gas burner, a fuel line for said'burner leading from a source of fuel under pressure, a

normally' losedvalve interposedin said line, a

carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, said valve and supporting means for the carriage having coacting parts to open the valve for fuel flow to the burner when the carriage is substantially at the limit of its movement in one direction, releasable means for holding the carriage in said position, timed means under control of the fuel during the operation of the burner to make the releasabley holding means ineffective, and means for moving the carrlage to its second position upon said release of the carriage. 4

4. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner leading from a source of fuel under pressure, a normally closed valve interposed in' said line, a

carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, said valve and supporting means for the carriage having coacting parts to open the valve for fuel ilow to the burner when the carriage is substantially at the limit of its movement in onev direction, timed means under control of the fuel owing when said valve is open constructedand arranged to allow'the carriage to move to its second position, a secondary fuel line for the burner, an automatically closing valve interposed in said secondary line, and thermostatic means associated with said second valve to maintain said valve open upon contraction of said thermostatic means.

5. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner leading from a source of fuel under pressure, a

normally closed valve interposed in said line, a carriage for the article t'o be heated, means for supporting the carriage for movement toward or from the burner, said valve and supporting means for the carriage having coacting parts Vto open the valve for 'fuel 110W tothe burner when the carriage is substantially at the limit of its movement in one direction, timed means under control of the fuel flowing when said valve is open constructed and arranged to allow the carriage to move to its second position, a secondary fuel line for the burner, an automatically closing valverinterposed in said secondary'llne, and thermostatic means associated with said second named valve for holding said second valve open when the surrounding ytemperature is belowa predetermined-degree, said thermostatic means allowing the said second valve to close when the surrounding temperature reaches such predeterf mined degree.

6. A toasting apparatus comprising, in combination, a gas burner, a carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, means for holding the carriage in one of said positions, timed means operated by the pressure of the fuel for releasing said means to allow the carriage to move to, its second position, and means for delivering to the burner the fuel exhausted from the timed means.

7. A toasting apparatus comprising, in combination, a gas burner, a 'carriage for the article to be heated, means for supporting the carriage v for movement toward or from the burner, means for holding the carriage in one of said positions,

timed means operated by the pressure of the fuel I for releasing said means to allow the carriage to move to its second position, and means for delivering tothe burner the fuel exhausted from the timed means, said timed means being inoperative when the delivery of the exhausted fuel is stopped.

8. A toasting apparatus comprising, in com-A bination, a gas burner, a carriage for the article to be heated, means for supporting a carriage for movement 'toward or from the burner, means for holding the carriage in one of said positions, timed means operated by the pressure of the fuel for releasing said means to allow the carriage to move to itssecond position, means for delivering to the burner the fuel exhausted from the timed means, and automaticl means for stopping said delivery when the carriage is in its second position.

9. A toasting apparatus comprising, in combination, a gas burner, a carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, means for holding the carriage in one of said positions, timed means operated by the pressure of the fuel for releasing said means to allow the carriage to move to its second position, means for delivering to the burner the fuel exhausted from the timed means, automatic-means for stopping said delivery when the carriage is in itsv second position, and means operating automatically to allow said delivery when the carriage is in its first position.

l0. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner leading from a source of fuel under pressure, a normally closed valve interposed in said line, a. carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner, said valve and supporting means for the carriage having coacting parts to open the valve for fuel iiow to vthe burner whenl the carriage issubstantially at the limit ofl its y movement in one direction, timed means under control of the fuel flowing when said valve is open constructed and arranged to allow the carriage to move to lits second position, and means operable at will and independentlyvof the timed means to allow the carriage to move to its second `position.

Yl1. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner, a normally closed valve interposed in said line, a carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner including an arm, means for mounting the arm for swinging movement, a Weighted member carried by the arm for swinging the armI and the carriage away from the burner, releasable means for holding the arm agains-t such swinging mo-vement when the arm is at the limit of its movement toward the burner, timed means for making said releasable means ineffective, said .arm when in its second position operatively engaging the valve to maintain the valve in open position, and a. motor for working the timed means operated by the pressure of the fuel.

12. A toasting apparatus comprising, in combination, a gas burner, a fuel line forisaid burner, a normally closed valve interposed in said line, a carriage for the article to be heated, means for supporting the carriage for movement toward or from the burner including an arm, means for mounting the arm for swinging movement, a.'

against such swinging movement when the arm is at the limit of its movement toward the burner, a shaft, means for rotating the shaft during the period the valve in the fuel line is open, said means being inactive when said valve is closed, a rotatable disk in driven connection with said shaft, a second disk carried by the rst disk for independent rotation, means for normally maintaining said disks in frictional contact for unitary rotation, a lug carried by the second disk,l a trigger member releasably engaging the arm to hold the arm in its second position, and including a part with which the lug contacts upon rotation of the disks for releasing the triggerI member from holding engagement with the arm.

13. A toasting apparatus comprising, in combination, a gas burner, a fuel line for said burner, a normally closedl valve interposed in said line, a carriage forV the article to be heated, means for supporting the carriage for move- 4ment toward or from the burner including an Ythe arm against such swinging movement when the arm is at the limit of its movement toward the burner, a shaft, means for rotating the shaft during the period the valve in the fuel line is open, said means being inactive when said valve is closed, a rotatable disk in driven connection with said shaft, a second disk carried by the first disk for independent rotation, means for normally maintaining said disks in frictional contact for unitary rotation, a lug carried by the second disk, a trigger ymember releasably engaging the arm to hold the arm in its second position and including a part with which the lug contacts upon rotation of the disks'for releasing d the trigger member from holding engagement disk sufficiently to return the lug'into position for a succeeding'operation.

14. A toasting apparatus comprising, in combination, a burner, a carriage, means for' supy porting the caniage for movement toward or fromv the burner, a manifold chamber, a pipe line leading from the manifold chamber to the burner, said manifold chamber being for communication with a source of fuel under pressure, a. pair of closed compartments, a diaphragm within each of said compartments dividing the same into two chambers, a pipe line in communication with each of said chambers and with the manifold chamber, a valve member within the manifold chamber for opening and closing the several'pipe lines in proper sequence, means for operating said valve member, a mechanism operating as pressure in proper sequence isimposed upon opposite sides of the diaphragms for moving'the valve member to open in proper sequence the several lines from the chambers, said valve member being constructed to allow the fuel as exhausted from the several chambers of the compartments to iiow to the burner, a shaft extending within the manifold chamber, anoperative connection between the shaft and the valve member within tlfe manifold chamber for rotating the shaft during the period of movement of the valve member, releasable means for holding the carriage in one of its position, and t means operating from the shaft for making said releasable means ineective.

15. In an apparatus of the character described,

chamber, a pipe line leading from the manifold chamber to the burner, said; manifold chamber being for communication with a source of fuel under pressure, a pair of closed compartments, a diaphragm within each of said compartments dividing the same into two chambers. a pipeline in communication with each of said chambers and with the manifold chamber, a valve 'member within the manifold chamber for opening `and closing the several pipe lines in proper sequence, said valve mm'eber having one face open to provide a chamber, the pipe line leading to the burner being at' all times in communication with said chamber and the ports closed by said valve member being also in communication with said chamber, a shaft within the manifold chamber, the ports being concentrically spaced around said shaft, the valve member being eccentrically mounted upon the shaft, a mechanism operating as pressure in proper sequence is imposed upon opposite sides of the diaphragms for rotating the shaft and valve member to open in proper sequence the several lines from the chambers, the chamber of the valve member allowing the fuel as exhausted from the several chambers of the compartments to flow to the burner, releasable meansfor holding said gas valve in open position, and timed means operating from the shaft for making said releasable means ineffective.

16.` In combination, a burner, a manifold chamber, a. pipe line leading from the manifold chamber to the burner, said manifold chamber being for communication with a so'urce of fuel under pressure, a gas valve in said pipe line, a pair of closed compartments, a diaphragm within each of said compartments dividing the same into two chambers, a pipe line in. communication with each of said chambers and with the manifold chamber, a valve member within the manifold chamber for opening and closing the several pipe linesin proper sequence, means for operating saidvalve member, a shaft within the manifold chamber, the communications between said manifold chamber and the pipe lines leading therefrom to the chambers of the compartments being concentrically spaced around the shaft, the valve member being eccentrically mounted upon the shaft, rock shafts extending within the manifold chamber, rock arms carried by the shafts and extending within the compartments, means for securing the rock arms to the diaphragms within the compartments whereby said rock shafts are operated upon movements of the diaphragms, rock arms carried by said rock shafts within the manifold chamber, links operatively connecting the rock armsV within the manifold chamber and the crank of the shaft whereby push and pull is imposed upon the crank in proper sequence to rotate the shaft and valve member carried thereby, releasable means for holding the gas valve in open position, and timed means operating from the shaft within the manifold chamber and as rotated from the dia` valve in said bypass in said oven," a thermostat controlling said valve to open the samewhen ther oveniscoolnandtogradually close the'sameas ingthesupplyotgasenteringsaidtimingmechl an'ism. a toast-carrying frame movable to and from a position adjacent said burner, and means u nder control ot said timing mechanism to move said frame away from said burner after a predetermined amount oi sas has passed through the timing mechanism. A A

19. A heating chamber, a burner therein. a gas line leading to said burner, a valve in said line, means to holdv said valve normally closeda rack movable into position to open said valve', a latch to retain said rack in valve-opening position, and timing mechanism in said gastline and operable by the gas flowing therethrough to release said latch and said rack and allow said valve to close.

WILLIAMAGRAHAM. u 

